Question

Multiple select. Choose all that apply: What is occurring as membrane potential reaches the value of threshold?
Group of answer choices

potassium ions are diffusing out of the cell

the action potential begins

voltage-gated sodium channels open

the membrane has returned to -70 mV

the membrane potential has reached -55 mV

Answer 1

- the action potential begins
- voltage-gated sodium channels open
- the membrane potential has reached -55 mV